diff --git a/prism/src/simulator/SimulatorEngine.java b/prism/src/simulator/SimulatorEngine.java
index 97fbd75e..1d9f6697 100644
--- a/prism/src/simulator/SimulatorEngine.java
+++ b/prism/src/simulator/SimulatorEngine.java
@@ -2188,7 +2188,7 @@ public class SimulatorEngine
 			else if (operand instanceof PCTLProbBoundedFuture)
 			{
 				long leftExpressionPointer = (new PCTLExpression(new ExpressionTrue())).toSimulator(this);
-				long rightExpressionPointer = ((PCTLProbFuture)operand).getOperand().toSimulator(this);
+				long rightExpressionPointer = ((PCTLProbBoundedFuture)operand).getOperand().toSimulator(this);
 				double lowerBound;
 				if (((PCTLProbBoundedFuture)operand).getLowerBound() != null)
 					lowerBound = ((PCTLProbBoundedFuture)operand).getLowerBound().evaluateDouble(allConstants, null);
@@ -2210,7 +2210,7 @@ public class SimulatorEngine
 			else if (operand instanceof PCTLProbBoundedGlobal)
 			{
 				long leftExpressionPointer = (new PCTLExpression(new ExpressionTrue())).toSimulator(this);
-				long rightExpressionPointer = (new PCTLNot(((PCTLProbGlobal)operand).getOperand())).toSimulator(this);
+				long rightExpressionPointer = (new PCTLNot(((PCTLProbBoundedGlobal)operand).getOperand())).toSimulator(this);
 				double lowerBound;
 				if (((PCTLProbBoundedGlobal)operand).getLowerBound() != null)
 					lowerBound = ((PCTLProbBoundedGlobal)operand).getLowerBound().evaluateDouble(allConstants, null);
@@ -2218,7 +2218,7 @@ public class SimulatorEngine
 					lowerBound = 0.0;
 				double upperBound;
 				if (((PCTLProbBoundedGlobal)operand).getUpperBound() != null)
-					upperBound = ((PCTLProbBoundedFuture)operand).getUpperBound().evaluateDouble(allConstants, null);
+					upperBound = ((PCTLProbBoundedGlobal)operand).getUpperBound().evaluateDouble(allConstants, null);
 				else
 					upperBound = Integer.MAX_VALUE;
 				return loadPctlBoundedUntilNegated(leftExpressionPointer, rightExpressionPointer, lowerBound, upperBound);
diff --git a/prism/src/simulator/simpctlbuilder.cc b/prism/src/simulator/simpctlbuilder.cc
index f6176e32..01308ffd 100644
--- a/prism/src/simulator/simpctlbuilder.cc
+++ b/prism/src/simulator/simpctlbuilder.cc
@@ -48,7 +48,7 @@ JNIEXPORT jlong __pointer JNICALL Java_simulator_SimulatorEngine_loadPctlBounded
 }
 
 JNIEXPORT jlong __pointer JNICALL Java_simulator_SimulatorEngine_loadPctlBoundedUntilNegated
-  (JNIEnv *env, jclass cls, jlong __pointer exprPointer1, jlong __pointer exprPointer2, jdouble lowerBound, jdouble upperBound, jboolean)
+  (JNIEnv *env, jclass cls, jlong __pointer exprPointer1, jlong __pointer exprPointer2, jdouble lowerBound, jdouble upperBound)
 {
 	CExpression* expr1 = jlong_to_CExpression(exprPointer1);
 	CExpression* expr2 = jlong_to_CExpression(exprPointer2);